perf(parser): optimize around parse_return_type

[ulrichstark]

• Removed has_return_colon because having both return_type and has_return_colon on ArrowFunctionHead was redundant
• Avoid redundant self.is_ts checks by moving only required ones to call site of parse_ts_return_type_annotation
• Removed unnecessary parameters return_kind and is_type from parse_return_type and their corresponding checks

Benchmark results:

parser[react.development.js] : +0.15%
parser[binder.ts]            : +0.05%
parser[cal.com.tsx]          : +0.01%

I expected more improvements on the benchmarks, but less code is also worth the change on its own.

[codspeed-hq]

CodSpeed Instrumentation Performance Report

Merging #12095 will not alter performance

_{Comparing ulrichstark:optimize-around-parse_return_type (cb0e2a3) with main (85ec382)}

Summary

✅ 38 untouched benchmarks

[Boshen]

@ulrichstark It seems like you are getting good with the codebase and the parser, may I invite you to work on the minifier as well? Contact me on discord if you are intrested, and I'll get you acquainted.